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how do you remove valve covers on 1998 Lincoln town car with 4.6 engine
Each cylinder has its own. Remove the covers on the valve covers and you'll find them there.
on the valve cover closest to the firewall
There are 8 ignition coils, one above each spark plug (known as a coil on plug or COP system). For access remove the pans (two bolts) on top of the valve covers (front one is labelled Intek V8).
On the valve cover, with a large vacuum hose attached
Remove the plastic cover if your car still has it installed and remove the bolts holding the covers on and remove, the drivers side is a pain, you may have to remove other parts so they can be removed.
Remove the vacuum hose from your 1995 Lincoln Town Car PCV valve. Remove the retaining screws from the valve. Reverse the process to install the new PCV valve.
Check the EGR valve.
You do have to remove 1 of them, either 1.
This should help. http://wiki.answers.com/Q/Where_is_the_pcv_valve_located_on_a_1998_lincoln_continental
Remove the air intake so you can see the 2 valve covers. Look between the 2 valve covers and there should be a cover plate. Remove it and your plugs are under it.
To replace the valve lifters on a Cavalier, remove the intake manifold, valve covers and rocker arms. Remove the heads of the lifters using needle-nose pliers.